Fan Motor Connector Output Check; Power Supply Waveforms Check - Daikin H Series Service Manual

Check
5.2

Fan Motor Connector Output Check

Check No.02 1. Check the connection of connector.
2. Check the motor power supply voltage output (pins 4 - 7).
3. Check the motor control voltage (pins 4 - 3).
4. Check the rotation command voltage (pins 4 - 2).
5. Check the rotation pulse (pins 4 - 1).
5.3

Power Supply Waveforms Check

Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
 Check to see if the power supply waveform is a sine wave. (Fig.1)
 Check to see if there is waveform disturbance near the zero cross. (sections circled in Fig.2)
Fig.1
Service Diagnosis
S1
Motor power supply voltage (310 ~ 340 VDC)
7
Unused
6
Unused
5
GND
4
Motor control voltage (15 VDC)
3
Rotation command voltage (1 ~ 6 VDC)
2
Rotation pulse
1
Fig.2
SiUS04-924_A
(R12099)
111